Impulser for magnetos.



H.0.PuTT

IMPULSER FOR MAGNETOS.

APPLICATION FILED 0509,1918.

1,326,529. Patehted Dec. 30,1919.

2 SHEETSSHEET I- Attorncy IMPULSER FOR MAGNETOS.

APPLICATKON FILED DEC.9, 1918.

1,826,529. Patented D60. 30,1919.

2 SHEETS-SHEET 2.

HARLIE 0. PUTT, 0F ELKHAR'I, INDIANA, ASSIGNOR T0 ANDREW IBEARDSLEY, OF

" onnron.

ELKHART, INDIANA.

IMPULSER FOR MAGNETOS.

' aaaasaa Application filed December 9, 1918.

To all whom it may concern:

Be it known that l[, HARLIE' O. PUTT, a citizen of the United States, residing at Elkhart, in the county of Elkhart and State of Indiana, have invented a new and useful limpulser for Magnet/0s, of which the following is a specification.

The object of my invention is to provide a novel improved cushioning device for cushioning the winding disk or stud in an impulser, to cause the armature of an ignition magneto to be actuated very quickly by means of a single coil spring which is compressed within a circular shell or housing. It is further my object to, provide a novel winding disk having a single stud in operative engagement with the coil spring, and to provide an improved arrangement of dogs and trips to control the periodic action of the impulser. It is an especial object of my invention to obtain the greatest possible cushioning effect, and to eliminate pounding shock and vibration as far as possible, and thus increase the life and efliciency of the instrument by utilizing themaximum winding space "and the maximum length of spring.

In former devices in this art arrangements of springs have been provided which effect a sudden stop of the impulse of the mechanism as well as the armature of the magneto to which it is attached, which proves very destructive to the life and efficiency of those members, and which it is the purpose of my invention to obviate.

Referring to the accompanying drawings illustrating my invention Figure 1 is an elevational view of my invention applied to a magneto;

Fig. 2 is a vertical section of my impulser;

Fig. 3 is an elevational view of the drive end of the impulser;

Fig. 4c is a transverse section on line 4i4: of Fig. :2;

Fig. 5 is a transverse section on line 5-5 of Fig. 2;

Fig. 6 is a transverse section on line 6-6 of Fig. 2;

Fig. 7 is a detail elevational view of the winding disk;

Fig. 8 is a side elevation of the winding disk;

Fig. 9 is a diagrammatic view showing the approximate position of the Specification of Letters Yatent. fatentgd D 9, 30, 1919,

Serial No. 265,873.

as shown in Fig. 4, which serve as stops for" suitable buttons 4 against which the opposite ends of the coil spring 1 abut. The spacing of the projections 3 to permit the stud or lug 7 to pass therebetween and which permits of the rotation of the member 7 sub-.

ject to the action of the spring 1 not only provides for that action, but also facilitates assembly of the winding disk for the tension of the spring is exerted against each side of the projections and permits of the easy insertion of the winding or driving stud 7 between the buttons 4 against which the spring bears; and its equally easy removal without affecting the position of spring 1. The housing 2 is preferably formed of sheet metal and is provided with suitable trips 5 oppositely arranged as shown in Fig. 5. I provide a novel winding disk 6 having a stud or lug 7 of such size and shape as to admit of its insertion between the stops 3 and the buttons 4, whereby the windin g disk may be actuated by the coil spring 1 which is in operative engagement with the buttons 4;, which are freely movable in the housing 2. Winding disk 6 is provided with suitable studs 7 oppositely positioned, on which are pivotally mounted the do s 8, each of which is provided with a pro ecting end 9 adapted to engage in the notched portion 10 of the cam 11 which is mounted on rear housing member 15. Armature shaft 14 is the standard taper magneto shaft, and to it is keyed by key 11, the hub 12 of the winding disk 6. The impulser case or housing disk 2 is provided with suitable outer studs 13, preferably of the type known as an Uldham coupling, but it is understood that any other satisfactory type of coupling may be fastened to the housing or shell without departing from the principle employed. This shell or housing 2 constitutes the driving member of the impulser, that is, it is ati. ll. t3

tached to the drive shaft of the engine on which the magneto is installed, while an actuating part of the impulserthe hub of the winding diskis rigidly attached to the magneto armature shaft.

It is within the contemplation of my 1nvention to make any suitable modification in the size and jarrangement of the parts without substantially departing from the principle of operation disclosed. Commonly, I employ two dogs 8, but one of these may be omitted when desirable.

The operation of the invention is as follows: lVhen the engine is turned over slowly the housing 2 rotates, and with it the winding disk 6 which is operatively connected with the housing by the stud 7. The dogs 8 which are carried by winding disk 6 are positioned diametrically opposite eat-h other, and as one of the dogs reaches the top side of the cam plate 11, which is rigidly mounted on the rear housing member 15 and frame 16, the projecting end 9 of the dog 8 falls into the notched portion l0 of the cam plate 11,

thereby arresting the rotation of the winding disk 6, and the hub 12 of the winding disk. As hub lzZ is keyed to the magneto armature shaft 14 when the movement of the winding disk is arrested the armature shaft is prevented from rotating, and this condition exists as long as the end of the dog remains caught in the notched portion of the cam plate.

As the operation of the engine continues the engagement of the winding disk stud 7 with the buttons 4 that bear against the coil spring 1 causes the spring to be compressed annularly until a trip 5 of housing 2 forces 4c the dog 8 out of the notched portion 10 of cam plate 11, thereby releasing winding disk 6 and coil or winding spring 1 and causing a rapid rotation of the armature shaft 14- which is keyed to the hub 12 of the winding disk 6. The armature of the magneto is thus rapidly rotated for a definite degree to a stop within the impulser housing, but by providing the annularly arranged spring 1 a cushioning efi'ect is obtained on the full length of the winding spring.- This construction gives the greatest winding space and the greatest cushioning effect. It also permits of either right or left hand operation without other changes except position- 66 ing the keyway, or timing to magneto. As will be understood by reference to the drawings, Figs. 2 and 4 particularly, the stud 7 of the winding disk is forced against one or the other of the buttons 4 and compresses 6c the spring in an annular direction, until the disk is suddenly released and instantly returned to normal position, the stud 7 striking against the head of the opposite button 4. and thus compressing the spring in that reverse annular direction until the force of messes impact has been totally absorbed. This action takes place with either a right hand or left hand winding or driving efi'ort. As shown in the drawings the device is arranged to operate as a right hand impulser. 70 To operate the instrument in a left hand direction it would be necessary to reverse the angle of the trips 5 and readjust their location, but the operation would be the same, substantially.

What I claim is:

1. In an impulser for a magneto, the combination of impulser actuating means rigidly attached to the magneto armature shaft, a coupling housing operatively attached to the 30 drive shaft of the engine and a single winding and cushioning coil spring annularly disposed within the coupling housing and having its ends operatively bearing against a portion of the impulser actuating means 35 to afford a cushioning effect for the full length of the aforesaid spring.

2. In an impulser for a magneto, the combination of a circular housing adapted to be attached to the drive shaft of the engine, a at winding and cushioning coil spring annularly arranged within said housing, buttons against which the coil spring bears at its respective ends, and means rigidly attached to the magneto armature shaft in operative ca engagement with the aforesaid buttons and spring, whereby the spring may exert a cushioning effect.

3. In an'impulser for a magneto, the combination of a magneto armature shaft, a

winding disk keyed to said shaft, an impulser housing operatively connected to the drive shaft of the engine, a coil spring annularly arranged within said housing and having its respective ends operatively bearing against a stud of the winding disk, the aforesaid stud aflixed t0 the winding disk, one or more dogs pivotally mounted on the winding disk,

a cam plate shaped to temporarily arrest the movement of the dogs, and one or more trips on the rotatable housing adapted to periodically release the dogs and actuate the armature shaft subject to the cushioning effect of the above-described spring, the above-described disks and trips being completely incased within the impulser housing, substantially as setforth.

4. In an impulser for. a magneto, an annular housing having opposite spaced proections, in combination with a winding disk comprising a hub portion having a key adapted to engage an armature shaft of a magneto, a diskportion, a stud projectingfrom the disk portion, said stud being freely movable between the aforesaid spaced projections of the annular housing, and one or more dogs pivotally mounted on the opposite side of the disk portion, for the purposes described.

5. As a new article of manufactiu'e, an MW masses impulser housing having coupling elements on it exterior, the housing havm a hub portion, a projection within the ousing adapted tooperate as an abutment member for an annularly arranged spring, and one or more inwardly bent portions of the housing disposed at an angle to operate as a trip 4 member for the purposes hereinbefore described,

6. In an impulser for a magneto, the combination of a magneto shaft, a'winding disk keyed to said shaft, and having a stud, one or more dogs mounted on the winding disk, a stationary cam plate having a notched portion shaped to temporarily arrest the movement of the dogs and winding disk, an annular impulser housing operatively connectedto the drive shaft of the engine, trips formed of a section of the housing adapted to engage and release the dogs from the cam plate, an annularly disposed spring in the impulser housing, the housing having spaced projections between which a stud carried by the winding disk is freely movable, members interposed between the ends of the spring and the aforesaid stud, whereby the spring is operatively connected to the winding disk to take up the impact of the disk when its rotative movement is arrested.

7. In an. impulser for a magneto, the combination of a housing adapted to be operatively connected to the drive shaft of the engine and shaped to protect the impulser mechanism from dirt and oil, a cushioning and winding spring annularly arranged within said housing, movable buttons against which the ends of the aforesaid spring bears, a Winding disk operatively connected to the magneto shaft and, said winding disk having a rojection positioned between the aforesaid uttons, whereby the spring may exert a cushioning andwinding effect.

8. In a device of the class described, the combination of a magneto armature shaft, a Winding disk keyed to said shaft, a stud near the outer portion of the winding disk, an impulser housing operatively connected to the drive shaft of the engine and substantially incasing the impulser mechanism to protect same from dust and oil, a spiral spring disposed in an annular chamber in said housing and having its ends in operative engagement with the stud on the winding disk, the impulser housing having one or more inwardly rojecting trips formed of a section of .sai housing, the impulser housing also having opposed spaced projections between which the stud of the winding disk is freely movable, one or more dogs mounted on the winding disk, a cam plate adapted to temporarily arrest the movement of the dogs under predetermined conditions, substantially as described.

9; As a new article of manufacture, an annular impulser housing shaped to substantially incase impulser mechanism to protect same from dust and oil, said housin having opposite inwardly extending spaced projections, and having one or more inwardy bent sections forming trips, substantially.as shown.

HARLIE O. PUTT. 

